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Mechanical Seal Maintenance/Replacement
Maintenance
Installing New Seal
MECHANICAL SEAL REPLACEMENT
1. Remove pump casing.
2. Remove O-ring and discard.
3. Remove impeller locking capscrew, lockwasher,
impeller washer O-ring and discard.
4. Unscrew threaded impeller.
NOTE: Pumps with clockwise rotation as viewed from
the shaft (driver) end have a right-hand threaded
impeller. Pumps with counterclockwise rotation as
viewed from the shaft (driver) end have a left-hand
threaded impeller. The impeller cap screw is always
right-hand thread.
5. Remove the seal retaining ring and pull the rotating
part of the seal off the shaft.
6. Remove the 2 capscrews holding the seal plate in
place.
7. Pull the seal plate out until it clears the shaft,
bringing the stationary part of the seal out with it.
Tap the seal out of the seal plate and clean the seal
cavity.
8. Inspect shaft sleeve, replace if necessary.
9. Install the new stationary seal in the seal cavity.
• Apply a small amount of mineral oil to the O-ring
or cup seat of the stationary seal.
• Use the seal installation tool to press the
stationary seal into place. (See
FIGURE 6).
• Do not damage the seal face!
10. Reinstall the seal plate. Hold in place with
2 capscrews.
• Cover all shaft threads with the seal installation
bull-nose tool to protect the seal during
installation.
• Apply a small amount of mineral oil to the inside
diameter of the rubber ring in the rotating seal and
to the outside of the shaft sleeve and the outside
of the seal assembly tool.
11. After lubricating the rotating part of the seal, slide it
onto the shaft and sleeve until it seats against the
stationary (ceramic) part using the seal installation
tool.
12. Compress the seal spring on the shaft sleeve and
reinstall the seal retaining ring.
13. Re-install impeller by threading onto the shaft until it
seats solidly against the shaft shoulder, then secure
using a new impeller washer, lock washer and
capscrew with Loctite
®
Threadlocker Red 271™ or
equal. Torque to 50 ft-lb (68 Nm).
• Reinstall casing using a new O-ring. Apply
Loctite
®
Threadlocker Red 271™ or equal the
casing capscrews. Torque to 100 ft-lb. (135 nm).
• Rotate pump to insure free rotation.
FIGURE 6
FIGURE 7
Polished Face up
Cardboard washer
(Supplied with seal)
6064 0609
Shaft Seal
Shaft
Casing
w/ Wear Ring
Frame
Mount
Bracket
Seal Plate
w/ Wear Ring
Impeller
Casing
O-Ring
O-Ring
Shaft Sleeve
External
Retaining
Ring
6585 0712
